Doorknob attachment



April 29, 1930; M; MCDONALD 1,756,871

DQORKNOB ATTACHMENT Filed May 14, 1929 Patented Apr. 29, 1930 UNITEDSTATES MARTIN MCDONALD, OF WASHINGTON, DISTRICT OF COLUMBIA DOORKNOBATTACHMENT Application filed May 14,

This invention relates to door knob attachments, and has for its objectto provide a new and improved device for concealing and preventinglooseness and loss of the screw commonly employed for securing a doorknob shank to the lock spindle.

The device of the present invention is complete in itself and includestwo longitudinal sections or members capable of being convenientlyassembled around the knob shank and secured to the door. The structureis such that the sections may be readily sepa-' rated and removed inorder to give access to the screw whenever it may become necessary toremove the door knob.

WVith these and other objects in view, the present invention consists inthe combination and arrangement of parts as will be hereinafter morefully described, illustrated in the accompanying drawings andparticularly pointed out in the appended claims, it of course beingunderstood that changes in the form, proportion, size and minor detailsmay be made, within the scope of the claims, without departing from thespirit or sacrificing any of the advantages of the invention.

In the drawings:

Figure 1 is a vertical longitudinal sectional view taken through thedoor and a knob spindle and shows the device of the present invention inits operative position.

Figure 2 is a cross-sectional view on the line 22 of Figure 1.

Figure 3 is a perspective view of the attachment of the presentinvention, the longitudinal sections or members thereof being separated.

Figure 4 is a fragmentary sectional view illustrating the innerlockingof the inner ends of the members of the device.

In Figure 1 of the drawings, there has been shown a door 1 through whichextends the usual lock spindle 2 carrying the knob 3, which is providedwith the usual cylindrir cal knob shank l having a rectangular bore,best shown in Figure 2 of the drawings, to snugly receive therectangular spindle 2, whereby the spindle may be turned by themanipulation of the knob. As usual the spindle is provided with a seriesof screw- 1929. Serial m3. 362,928.

threaded openings 5 to receive the shank of the screw 6, which passesthrough the open ing in the knob shank 4. These parts are common andwell known and form no part of the'present invention, but are shown inthe drawings in order to properly disclosethe operation of the presentinvention.

Referring now more particularly to Figure of the drawings, it will beseen that the present device includes upper and lower longitudinalsections 7 and 8, which sections are semi-tubular in shape and are ofthe size to register and produce a cylindrical casing. At the inner endsof the members, there are provided the heads or flanges 9 and 10, whichmaybe semi-circular in shape or of any other desired configuration. Theinner edges of the heads 9 and 10 are straight and rabbeted at 11 toform an interconnection for the members and prevent endwise loosenessthereof. The lower member 8 isp'rovided at its outer endwith:a ring orband 12 integral there- I with or secured thereto in any manner andarching over -the open top of the lower sec.- tion 8.. w y

In using the device, the lower section 8 is placed upon'the spindle, andthen the knob and-its shank are placed endwise upon the spindleandthrough the keeper 12, after which the lower-section 8 is gsecured tothe door by-means o fa screw 13 passed through; the perforation 14 in;the head or flange'lO. In this condition, the top of the knob shank 4 isin plain view 3150- that it- -may'beidetermined whether or not there isany space be tween the end of the shank 4 and the door andgif such aspace'exists, the knob is removed, a washer-lo'slipped over the spindleand then the'knob replaced,after which the screw 6-is applied so as tohold the knob on the spindle. Then the-upper'section 7 is ap-' piled byinserting its outer end-"withinthe keeper 12 and then bringing it downinto. seat-ingengagement with the top edgeof the lower memberB, afterwhich'suitable fastenings 16 are inserted through the openings 17 in thehead 9 so as to hold the upper section 7 in place.

l/Vhen all of the members have thus been assembled, the upper section 7entirely conceals the head of the screw 6, is in contact therewith or invery close proximity thereto, and thereby prevents looseness and loss ofthe screw, whereby the knob will always remain tight upon the spindle 2.

In order to remove the knob, the fastenings 16 are removed, after whichthe topfsection 7 may be tilted upwardly and its outerend withdrawn fromthe keeper 12, whereupon access may be had to the screw 6 to release theknob. j V V 7 From the foregoing description, it will be readilyunderstood that the device of the present invention is entirely completein itself and capable of being applied'to any ordinary door knob withoutrequiring any change or alteration therein whatsoever and withoutrequiring any change or preparation in the door. Aside from the threescrewthreaded tastenings, the device includes two members only, whichmay be cast or other-s wise made in a very simple and inexpenslve'manner. When in place, the attachment effectually conceals and holds inplace the screw employed to securethe knob to the spindle, and when inplace gives a neat and ornamental appearance.

WVhat'is claimed is z 1 'Thecombination with a door knob and its tubularshank. a lock s indle and a screw extending through the shank'andengaging the spindle to hold the knob thereon, of means forconcealing'and preventing looseness and loss of-the screw, comprising alongitudinally split sleeve embracing the shank and covering the'head ofthe screw, that end of the sleeve opposite the knob having anoutstanding peripheral flange for connection with the door, and one ofthe sleeve members being provided with a keeper located next 7 totheknob and embracing the corresponding end of the other sleeve member. Q

2. A door knob attachment comprising a longitudinally split sleeve, oneof the sleeve members being provided with a keeper arching across itsopen side, the other sleeve member havmg one end embraced by the keeper,

and the other ends'of the members having outsanding heads or flangesprovided with openings for the reception of' fastening devices.

' 3. A door knob attachment comprising'a longitudinally split sleeve,one of the sleeve membersbemg provldedwith a keeper arching across itsopen side, the other sleeve memher having one'end embraced by thekeeper,

and the other ends of the members having outstanding heads or flangesprovided with openingsfor the reception of fastening devices the meetingedges of the heads or flanges being rabbeted.

V MARTIN MCDONALD.

